Light-emitting diode display and its pixel driving method

A technology of light-emitting diodes and driving methods, applied in static indicators, electroluminescent light sources, instruments, etc., can solve the problems of inconsistent driving current, decreased display brightness, and uneven picture brightness.

Active Publication Date: 2009-02-04
AU OPTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this way, it will cause the conduction current I OLED Decrease, because Vgs=Vdata-V OLED
This phenomenon makes the pixel voltage Vdata unable to make the organic light emitting diode 106 produce a predetermined luminance, that is to say, the overall display luminance of the display screen will decrease.
[0005] To sum up, even if the problem of inconsistency of the driving current caused by the offset of the threshold voltage is solved, the brightness of the screen will decrease or the brightness of the screen will be uneven due to the characteristics of each OLED material.

Method used

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  • Light-emitting diode display and its pixel driving method
  • Light-emitting diode display and its pixel driving method
  • Light-emitting diode display and its pixel driving method

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Embodiment Construction

[0029] The invention provides a driving method of a light-emitting diode pixel, which can simultaneously solve the problem of the critical voltage shift of the thin film transistor and the material attenuation of the light-emitting diode. Please refer to image 3 , which is a flow chart of driving LED pixels in the present invention. First at step 300, the storage capacitor is reset. Next, in step 302, the storage capacitor is discharged through the driving thin film transistor and the light emitting diode until the conduction current of the light emitting diode is almost zero, so as to record the critical conduction voltage of the driving thin film transistor and the light emission in a specific state The sum of the cross-voltage of the diode, and then in the subsequent process of driving the light-emitting diode to light up, by using the sum of the critical turn-on voltage and the cross-voltage of the light-emitting diode, the difference between the threshold voltage shift ...

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Abstract

The light-emitting diode display and the driving method for its picture elements include that: discharging the memory capacitor when they pass through the drive thin film transistor and the light-emitting diode until the break-over current of the said light-emitting diode almost vanishes to register the sum of critical break-over voltage of the drive thin film transistor and the profiled voltage of the light-emitting diode, accordingly in the subsequent rutilant course of the drive light-emitting diode, by the sum of critical break-over voltage of the drive thin film transistor and the profiled voltage of the light-emitting diode, the brightness descension problem caused by the critical voltage displacement of the light-emitting diode and the absorption of the light-emitting diode can be improved.

Description

technical field [0001] The present invention relates to a light emitting diode display, and in particular to a method for driving light emitting diode pixels. Background technique [0002] A pixel of an Organic Light Emitting Display (Organic Light Emitting Display) generally uses a thin film transistor (Thin Film Transistor, TFT) with a storage capacitor to store charges to control the brightness of the Organic Light Emitting Diode (OLED). Please refer to figure 1 , which is a schematic diagram of a conventional pixel circuit. The pixel circuit 100 includes an N-type thin film transistor 102 , a storage capacitor 104 and an organic light emitting diode 106 as an example for illustration. Both ends of the storage capacitor 104 are connected between the gate G and the source S of the thin film transistor 102 , and the voltage across the capacitor is denoted as Vgs. The anode of the organic light emitting diode 106 is coupled to the source S of the thin film transistor 102,...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): G09G3/32G09G3/30G09G3/20H05B33/08H05B33/14G09G3/3258H05B44/00
Inventor陈勇志李国胜吴鼎文施立伟林志隆
OwnerAU OPTRONICS CORP